Grace Wallace was the only child of a widow of decidedly meager means. Mr. Rupert Howland, a widower of considerable wealth, the father of a girl child, and an old friend of the family, often surreptitiously helped them. He dearly loved the young girl, but it was only at the death-bed of Mrs. Wallace that he really showed it. The poor woman at the point of death realized the helplessness of those she was leaving behind, her own aged parents and her daughter Grace. To assure their future she begged Grace to marry their dear friend, and Grace, touched by the man's goodness and her mother's condition, consented. Not content with the promise, she asked that the marriage take place at once by her bedside, and the wish was granted. Poor Grace struggled hard to love the dear old man, but while she admired and respected him, and was profoundly grateful for his kindness, she could not love him.
A young woman doesn't want to get married, but simply live together with the man she loves. This leads to problems when the man dies and she's left with a child.
To help secret serviceman Bill Parsons in pursuit of the thieving Benson gang wealthy criminologist Henry Avery sends his assistant Blinky to cover the waterfront while he attends a reception at the home of Mrs. Cornelius Westervelt. At the soiree he meets gang member Alice Carter while also discover the gang’s cache hidden there. Captured Parsons is saved by Blinky, and the pair foil the gang’s attempt to rob Mrs. Westervelt and her guests.
Two married couples, Doris (Helen Chadwick) and John Manning (Gayne Whitman) and Clara (Dorothy Revier) and Herbert Bradley (Ray Ripley), each separate as a result of domestic arguments. After certain misunderstandings and false accusations, peace is returned on the home front.
Lydia Jansen is happily married to a young customs inspector, but she harbors a dark secret. She is addicted to smoking opium or in slang parlance “hop.” To keep her secret, she willingly pays the blackmail her maid extorts from her having learned of Lydia’s habit through her own fiancée who is part of the ring importing the devil’s brew. Something unknown to all is that the operation is run by Lydia’s father an important politician in the city where this all occurs. As her husband’s investigation tightens the noose on the organization Lydia faces a crisis.
Two British officers are assigned to collect information to convict Captain Kidd of piracy.
Mota is a Martian representative, who has come to impose interplanetary law on the Earth (which has become too dangerous); opposing his authority is Kent Fowler, who resists the alien plot, without understanding its details.
Prior to the United States' involvement in World War II, the masked vigilante Spy Smasher fights Nazi agents operating within the US, led by the treacherous sabotage leader codenamed The Mask.
Jerry Blake (aka Federal Operator 99) teams-up with Joyce Kingston to thwart the plans of escaped crime boss Jim Belmont.
An expedition arrives on an uncharted jungle island to rescue the local natives, led by a jungle boy, from a volcano that is about to erupt.
Escaped Prisoner 39013 impersonates the rich and influential Horace Granville, allowing him to create a variety of disasters. Fortunately, he is thwarted repeatedly by three daring circus daredevils.
A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster's mission!
Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.
Dr. Ernst Grood , having already dominated the planet Ergro, now intends to take over the control of the Earth. Unfortunately for him, reporters oppose his sinister designs.
Greedy traders have kidnapped a researcher, hoping he will reveal the location of a treasure in a hidden village. Family and friends of the researcher come looking for him. Adventure ensues.
Firemen Tom and Joe each loves the other's sister, although neither is able to support a wife. Tom's troubles are compounded by a rival for his sweetheart's hand. In a drawn out fight he bests the rival, who steals the revenue from the firemen's ball (of which Tom is treasurer) and hides the money in the storage warehouse in which Tom's sister works as a stenographer. While Tom, Joe, and their sweethearts search for the money, the villain also returns for his loot, and, in his haste, he sets the building afire--trapping the foursome behind a steel door. Their calls for help reach the street, an alarm is turned in, firemen come to the rescue, and the money is found in a blazing desk.
During his daily duties, Casey the Cop rescues a woman who's soon his sweetheart. Later, she learns from her banker uncle that her inheritance has been stolen, and he's accusing Casey's own cashier brother. Casey is on the case.
Betty falls in love with Samuel Hayden, who was washed ashore after having survived a shipwreck. The self-acclaimed most religious man in town accuses a kindly man, whom he calls "The Devil," of robbing Samuel. Soon becoming bored with this slander, he attempts to break up the romance between Betty and Samuel, contriving to have her turned out by her stern father. Samuel is later discovered to be an escaped convict. This disclosure results in a series of escapades during which the true character of the village hypocrite and "The Devil" are revealed, showing the former to be vicious and the latter to be generous and benevolent.
A high-society woman, Glenna Marsh (Dorothy Revier), is arrested for the murder of gigolo-gambler Cole Norwood (Norman Trevor), but his honest casino partner Peter Dane (Tom Moore) proves her innocence.
Blinded in a train accident James Driscoll (Holmes Herbert), whose wife, Miriam Driscoll (Belle Bennett), has been having an affair with his young male secretary Phillip Kingston )Carroll Nye), regains his eyesight. He keeps this from his wife, who continues her affair. Finally, he invites his young niece Nancy Driscoll (Josephine Borio) in the hopes she will fall for Philip and vice-versa. His ploy works, James reveals he can see again, and husband and wife are reconciled.